Signal-transmitting apparatus and system



9 E S A H C A H SIGNAL TRANSMITTING APPARATUS AND SYSTEM.

Patented June 4, 1895.Y

'Wl TVIEEJEEEII 1 n Noam; Pneu (No Model.) 9 Sheets-Sheet 3.

H. A. CHASE.

SIGNAL TRANSMITTINGAPPARATUS AND SYSTEM.

No. 540,422. Patented June 4, 1895.

(No Model.) 9 Sheets-Sheet 4. H. A. CHASE. SIGNAL TRANSMITTING APPARATUS AND SYSTEM.

No. 540,422. Patented June' 4, 1895.

l LUEESEa (No Model.) 9 Sheets-Sheet 5. H. A. CHASE.

SIGNAL TRANSMITTING APPARATUS AND SYSTEM.

Patented June 4, 1895..

(No Model.) 9 sheetssheet 6. H. A. CHASE.

SIGNAL TRANSMITTING APPARATUS AND SYSTEM.

Patented June 4, 18952 (No Model.) 9 Sheets-Sheet 7.

H. A. CHASE. SIGNAL TRANSMITTING APPARATUS AND SYSTEM.

No. 540,422. Patented June 4, 1895. Y

(No Model.) 9 Sheets-Sheet 8.

H. ACHASE. Y SIGNAL TRANSMITTING APPARATUS AND SYSTEM.

Patented June 4, 1895.

- WAGON TELEPHONE (No Model.) 9 Sheets-Sheet y9.

. n H. A. CHASE.

SIGNAL TRANSMITTING APPARATUS AND SYSTEM. No. 540,422.

Patented June 4, 1895.

@L D T .N MJ JM UNTTED STATES PATENT OEETCE,

HENRY A. CHASE, OF BOSTON, MASSACHUSETTS, ASSIGNOR, BY -MESNE AS- y SIGNMENTS, TO THE METROPOLITAN DUPLEX FIRE AND POLICE SIGNAL COMPANY, OF PORTLAND,-MAINE.

SIGNAL-TRANSMITTING APPARATUS AND SYSTEM.

SPECIFICATION forming part of Letters Patent No. 540,422, dated June 4, 1895.

Application iled September l, 1892. Serial No. 444,725. (No model.)

To 1r/ZZ whom it may concern:

Beit known that I, HENRY A. CHASE, of Boston, county of Suffolk, and State of Massachusetts, have invented an Improvement in Signal-Transmitting Apparatus and Systems, of which the following description, in connection with the accompanying drawings, is a specification, like letters and figures on the drawings representing like parts.

This invention relates to a system and apparatus for the transmission of signals, and is especially designed and adapted to be used as a combined tire and police telegraphic system.

Experience has demonstrated, that a re alarm signal should be transmitted by substantially long interruptions or breaks in the electric circuit, in order to avoid all possible danger of obtaining false signals, whereas in police signal work, it is desirable and in fact necessary, to transmit the signal in a substantially rapid manner, owing to the frequency with which signals' are transmitted to the central office or station, which is accomplished by transmitting the signal in a series of shorter interruptions or breaks in the electric circuit.

My present invention has for one of its objects to provide a `signal transmitting apparatus or box constructedand arranged as will be described, whereby in the normal condition of the apparatus or box with its door closed, the same is a fire alarm box and the signal or number indicative f the box, may be transmitted in one set of characters, namely, in a series of substantially long interruptions or breaks, to indicate a tire alarm signal7 and when the door is opened, the condition of the signal transmitting apparatus is automatically changed, and the apparatus or box transformed -into a police signal box, so that vwhen set in operation, the same signal or number will be transmitted in a different or distinguishing set of characters, namely, a seriesof substantially short interruptions of the electric circuit to indicate a police signal, the said box or apparatus remaining as a polic'e box, as long as the box door is opened.

Another featureof my invention consists in constructing the signal transmitting apparatus as will be described, so that when the door is opened, additional signals may be transmitted in conjunction with the signal or number indicative of the box, to indicate special police signals.

Another feature of my invention consists in a novel construction of the transmitting apparatus as will be described, whereby a grounded circuit isY automatically closed in the transmitting apparatus, when the said apparatus is operated to transmit preferably a 6o re signal, and of a novel construction of receiving apparatus, whereby the full main line battery may be included in a grounded circuit over which the signal may be received in case of a break in either side of the main line, and whereby the main line local circuits, may also be used in connection with and be operated by the grounded circuit, as will be specifically pointed out hereinafter.

Another feature of my invention consists of 7o a novel construction ot' the box or apparatus, whereby the operating pull or hook is extended into a supplemental case or chamber, secured to or forming part of the box door,

and provided at its front side with a transparent frangible covering forming a portion of the box door, whereby when the box door is closed, the transmitting apparatus or box has the appearance of a lire alarm box pure and simple, with the transmitting pull or hook 8o plainly in sight.. The box or transmitting apparatus is also provided, as herein shown, with an audible street alarm automatically controlled in its operation by the transparent coverfor thesupplementalchamberor casing.

Another feature of my invention consists in providing a locking device for-the box door to prevent the same being opened, while a tire alarm signal is being transmitted, and another feature consists in providing a stopping de- 9o vice to prevent the box door being closed While a signal is being transmitted.

Other features of my invention will h e pointed out in the claims at the end of this specification. 95

Figure l is a front elevation, partially broken out, of a signal-transmitting apparatus or box embodying my invention; Fig. 2, a horizontal section through aportion of the box shown in Fig. 1 on the line 2 2, the box-door roo being represented by dotted lines in its open position; Fig. 3, a detail in front elevation of the dial, its co-operating pointer, and the mechanism for actuating the pointer, the pointer being shown in its normal position; Fig. 4, a like detail in elevation of the dial, showing the pointer in another position from its normal; Fig. 5, a detail in elevation of the dial, showing the pointer in still another position from that shown in Figs. 3 and 4; Fig. 5, a detail to be referred to; Fig. 6, a detail in front elevation of the transmitting mechanism located in the box shown in Fig. 1,the transmitting mechanism being shown in its normal position and the cooperating pointer being broken out; Fig. 7, asectional detailof the transmitting mechanism, it being represented by full lines as inl position to transmit a resignal; Fig. 8, a vertical section through the box-door and dial-plate of the box shown in Fig. 1, the section being taken on the irregular line S 8, Fig. 1; Fig. t), a View in perspective of the movement or transmitting mechanism shown in Fig. 6; Fig. 10, a perspective of the movement shown in Fig. 6, looking from the rear of Fig. 9, with the pointer turned into a different position from that shown in Fig. 9; Fig. 11, a diagram of circuits to enable my invention to be more readily comprehended, the said diagram representing the system in its normal condition for transmitting and recording a fire-alarm; Fig. 11, a detail to be referred to; Fig. 12, a diagram of circuits, showing the system as transformed into a grounded circuit; Fig. 12, a detail to be re ferred to; Fig. 13, a detail of the escapement to be referred to; Fig. 14, a detail of the signais transmitted with the apparatus shown in Fig. 1, and Fig. 15 a detail to more clearly show the stop for preventing the box-door being closed when the actnating'hook is ont of its normal position.

Referring to Fig. 1, A represents a transmitting apparatus or box embodying my invention,it being preferably made of iron and provided with the usual door A', which may be secured to the box A by hinges A2 orin any other usual or desired manner.

The box A has located within it a vertical dial plate A4, shown separately in Fig. 5, and which divides the case orshellintotwo chambers or compartments a, a. See Fig. 8.

The transmitting apparatus or box has located within it a signal transmitting mechanism, constructed and arranged as will be described, to transmit its signalsin distinct sets of characters, that is, the signal or number indicative of the box is transmitted in a series of long impulses and in a series of short impulses.

The signal transmitting mechanism is preferably constructed to transmit the same signal at different speeds substantially as shown and described in United States Patent No. 472,983, dated April 19, 1892.

The signal transmitting mechanism, shown best in Figs. 9 to 12 inclusive, consists as herein shown, of a series of seven signaling surfaces, preferably break Wheels of any usual or well'known construction and marked respectively, a2, d3, a4,a5,a,a7,d8, the said break Wheels being mounted on a shaft a9, having bearings in a suitable frame work aw. The break Wheel shaft ai is rotated through gear ing herein shown as consisting of a gear wheel cl2 on the shaft a9, in mesh with a pinion als, see Figs. 5 and 7, on a shaft a having bearings in the frame Work am, and provided at one end With an escape wheel a, of any usual construction, With which meshes au escape or pallet bar Q16, loosely mounted on a shaft or arbor (1,17. The break Wheel shaft ai also has loosely mounted on it a pinion als in mesh with a segmental gear al, mounted on a shaft d20, actuated by a motor, shown as a spring am, but which may be a Weight, after the manner of the Well-known fire alarm transmitting apparatus, the shaft ai having secured to it, an arm azz-see Fig. 6, to which the usual pull bar or rod L23 is pivotally connected.

The transmitting mechanism is constructed after the usual manner of the fire alarm transmitting mechanism, to permit the actuating pull bar (L23 to be moved downward without rotating the break wheels, which is accomplished, as herein represented,see Figs. t) and 10, by means of a toothed or pallet disk c25, secured to the pinion als, the said toothed disk engaging a Ispring pawl (L26 secured to the gear wheel au. The pawl L26 is constructed to permit the toothed disk c25 to be revolved in one direction, indicated by arrow 2O Fig. 10, without actuating the gear wheel a, when the actuating hook or pull bar @23 is drawn down in the direction of arrow 2l Fig. 6, but which engages a tooth on the said disk, and rotates the gear a, its shaft a" and the break wheels, when the segmental gear al" is restored to its normal position by the motor mechanism or spring Q21.

The motor mechanism referred to, is provided as herein shown, with a speed changing device, herein represented as a disk a, see Figs. 5, 6, and 7, loosely mounted on the escape shaft a to slide thereon, and adapted to be coupled to the escape or pallet bar al, by a pin t28 on the escape enteringa suitable hole or opening in the disk 0.27, the said disk being secured to or forming part ot' a sleeve a2", see Fig. 13, having an annular' groove engaged by the forked end of a lever ctiopivoted as at a300, see Fig. 7, to a portion of the frame work d10, and having its other end provided with a stud or projection asl extended into a cam-shaped groove am, see Fig. 10, made in the periphery of the uncut portion of a disk 0.320. provided with teeth L33 forming what is technically known asa star Wheel, with which cooperates a locking or holding spring ai, secured to the frame Work ctw of the transmitting apparatus. The disk uzois fast upon a shaft @35, having bearings in an upright a3 secured to the frame work am, and in the dial A, through which the said shaft is extended,

TIO

the latterl having fastened to it outside of the dial A4, a pointer or indicator a37. The upright L36 is preferably made of insulating material, and has secured to it a circuit terminal stripV or segment 5, and independent smaller terminal strips or segments 5, there being six such terminal strips or segments 5 herein shown, and numbered 0, 1,72, 3, 4, and 5 to correspond with like indications or numbers on the dial A4, see Figs. 3 and 4, and with which latter indications the p ointer 137 co-opcrates. The shaft L35 has secured to it, as by a screw 53, see Fig. 9, a hub or sleeve 53, having secured to or forming part of it, an arm 54 to which are secured contact brushes or pens 55, 56, electrically connected together in any suitable manner, they being herein represented as formed from asingle piece of metal. rlhe pens 55 56 and the terminal strips 5, 5 form a main line circuit controller.

In the normal condition of the transmitting mechanismthe shaft 61,33 occupies such a position, that the contact brushes or pens 56,'56, make contact with and electrically connect the circuit terminal strip 5 with the terminal strip 5 marked 0, as shown in Figs. 9, 11,l

and l2, and at such time the lever a30is turned by the cam groove in the disk e336, so as to engage the weight or disk Q37, with the escape or pallet bar 0,16, so that, if the transmitting mechanism should be setin motion, it would run at a substantially slow speed, anda signal indicated by the break wheels a3, d3, a4, would be transmitted to the central station in one set of characters, that is, in substantially long interruptions or breaks in the electric circuit, connecting the transmitting mechanism with the central station.

. Referring to Fig. 11, l have represented in diagram the transmitting apparatus as connected in an electrical circuit including a main linebattery B, located in the central station, represented by dotted lines, the said battery having one pole, as for instance the positive pole, connected by a wire 516, to one coil of an electro-magnet or relay 513, having the other end of its coil connected by wire 513 with 'the circuit terminal strip or segment 5, the

other pole of the battery B being connected by wire 514 to one end of the coil of an electromagnet or relay 515, having the other end of its coil connected by a Wire 516 to a circuit terminal stud or button 517, with which co-operates a circuit controller or switch 513,shown as a pivoted lever, having its pivot connected by wire 51 to a contact pen or brush 530, cooperating with'the break wheel a3, the wire 519 as represented in Fig. 1l including a second box or apparatus A. The break wheel a3 is provided on its periphery with a series of teeth or notches ctx, indicative ot the number of the transmitting apparatus or box, which in the present instance is 99. The break wheels a3, a4 are likewise provided, as herein represented, with the same number oi' teeth, and the break Wheel a4 is precisely the same as the break wheel a3, whereas the break Wheela3 differs from the Wheels a3 a4, in that it is provided on its periphery with a substanc tially long notch 533, whereasthe break wheels n.3 a4 have their peripheries unnotched with the exception of the teeth ctx. The break wheels a3 a4 have co-operating with them contact pens or brushes 533, 534, the contact pen 534 being connected by a branch wire 525 tothe zero circuit terminal 5 of the main line circuit controller located in the box. The contact pens or brushes 533 534 are permanently in engagement with the periphery of the break wheels a3 0.4, when the said break wheels are in their normal condition, while the contact pen or brush 533 is preferably out of contact with the break wheel 0,3.

In practice the break wheels a?, a3, a4 aresecured upon the shaft a9 with their teeth in coincidence, so that, in the revolution of the break wheel shaft a3, the teeth of all the break wheels a3, a3, a4, make contact with their cooperating contact pens or brushes, simultaneously as one wheel.

The remaining break wheels a3, 0,6, a7, a3, shown in diagram in Figs-11 and 12 have cooperating with them respectively, contact pens or brushes 536, 531, 533, 533, respectively connected by branch wires 534 535 536 and 537, to the circuit terminal segments 5 marked respectively 1,2, 3, and 4.

The break wheels a3, a6, a7, a3, are provided with one or more teeth or notches on their peripheries, which co-operate with, thevmain signal or box number as will be described, to indicate a special signal, and in the present instance, the break wheel a5 is provided with f described, inra series of long interruptions or breaks, due in the present instance to the substantially slow rate of movement of the inotor mechanism, but if the pointer Q37 should be moved'to any other indication on the dial, as for instance, to the indication marked 1, the shaft @33 would be'rotated in the direction indicated by arrow 22 Fig. 9, and the lever @30 turned on its pivot w30, so `as to withdraw the disk or weightv 0,37 from engagement with the pin @L33 on the escape Q16, thereby permitting the transmitting mechanism to be operated at a substantially high rate of speed. The disk @27, when disengaged from the pin (L33, is kept in correct position to permit the pin 01,33 to enter the opening in the disk a3?, when restored toits normal position, by a guiding pin or stud 0.30, see Fig. 13, extended' into a slot @L51 `in the hub (L33. When the pointer has been moved to register with the vindication marked 1 on the dial, thev contact IOO IZO

` 'ection e9 on the said ointer.

pens b5 L6 will bemoved so as to electrically connect the terminal strip or segment l) with the terminal strip or segment b marked l.

If the transmitting mechanism should be set in operation when the pointer registers with theindication lon the dial, the box number indicated by one of the Wheels a2, a3, a4, will be transmitted to the central oitice in a diiferent set of characters from those in which the box number is transmitted, with the pointer in its normal position, and as herein represented an additional signal indicated by the notches or teeth l0 in the break Wheel a5 will also be transmitted.

One of the objects of my present invention is to eii'ect a change in the condition of the transmitting mechanism by the opening ofthe box door A', so that when the said transmit ting mechanism is operated, the character of the signal is changed, and I accomplish this feature of my invention, by an intermediate connection as will be described, which in the present instance couples the box door A with the pointer 0.37.

The intermediate connection referred to, consists essentially as herein shown, of a sliding bar or rod c,--see Figs. 2 and 5, movable in a suitable guide c secured to or forming part of the dial A4, the sliding rod c, as shown in Fig. 2, being joined by a link c2 to one end of a lever c3, pivoted as at c4 and having its end connected by a link c5 to a boss or projection c6 on the inside of the door A. The sliding bar c is detachably connected to the pointer @37, it being provided with fingers or projections c7, o8, adapted to engage a stud or pro- The finger cS is made rigid and also is longer than the iinger c7 for a purpose as will be described, and the finger cT is preferably made movable or as a pivoted member, which is normally pressed down into its operative position by a dat spring c100 secured to the top of the slide bar c, the linger c7 being made movable for a purpose as will be described.

In the normal condition of the box or transmitting apparatus, the pointer al occupies the position shown in Fig. 3, it registering with the 0 indication on the dial, and at such time the box door A is closed, and the lever c3 and links c2, c5, occupy the full line position shown in Fig. 2. When the box door A is closed, it may and preferably will be locked by means of a key, not shown, inserted into a key hole elo. See Fig. l. When the box door A is locked, the signal transmitting mechanism may and preferably Will be set in operation by pulling upon a hook clzextended through a slot c13 in the dial A4, the said hook being secured to the pull bar n.23.

In order to render the hook c12 accessible, when the box door is closed, the said door is provided, as herein shown, with a substantially large opening normally covered by a frangible covering c, preferably a pane of glass through which the operating hook may be plainly seen.

To still further characterize the box or transmitting apparatus as a fire alarm box when the door A is closed, the said door has secured to or forming part of its rear side, a frame or casing C15-see Fig. 8, preferably detachably secured to the bo'x door A', by screws c16 extended through suitable openings or holes cX in lugs c17 secured to or forming part of the casing C15. The holes or openings c are preferably made oblong, so that the box casing C15 may be slipped oft the screws when the box door is opened, if it is desired to remove the same.

The casing or frame 015 is preferably provided, as shown, with a rear wall C18 having a vertical slot c15| through which the hook c12 extends into the casing, and preferably with a substantially horizontal notch 7L', for a purpose as will be described. The interior of the casing 015 may be painted red or any other color to clearly identify this particular portion of the combination box with the ordinary re alarm box, which is usually painted red, and in addition the rear Wall of the casing may be provided with suitable Words desg- -nating the manner in which the box is to be operated in case of fire. By extending the operating hook cl2 into the casing c15 and providing the latter with suitable directions for operating the hook, and also by rendering the said hook visible by means of the pane of glass c, ordinary persons can readily see what is to be done in case they desire to send a fire alarm signal, thereby avoiding confusion on the part of such persons operating the fire alarm and saving valuable time in the beginning of a fire, which in practice means a quicker response ofthe fire department, thereby oftentimes effecting a saving of human lives as Well as property.

In order to deter mischievous and unan thorized persons from breaking the glass 014 and reaching the hook to send in a tire alarm signal, the box or apparatus is provided with an audible street alarm, automatically controlled by the breaking of the fran gible coverin g c14 substantially as shown and described in United States Patent No. 465,989, granted to me December 29, 1891.

The audible street alarm, as shown in Figs. l and 8, is attached to the back of the door A above the casing c, and consists essentially, as herein shown, of a gong or bell C20 and a striker ci1 secured to a bar or rod 022 fastened to a spring actuated lever o23, pivoted on a shaft or arbor 024 having bearings in the frame work c25 of a clock or motor mechanism 026, the lever o23 being fastened at one end as by a screw CET/to a fiat spring C28, having its other end secured to a crank or arm 029, by set screw e30, which is extended through a slot in the lever o23, so that that end of the said lever is free to rise and fall. The shaft 024 has secured to it, as shown, a substantially horizontal arm 031, normally resting on an arm or projection cS2 on the rock shaft 033, having bearings in suitable lugs 034 and provided with one or IIO more crank arms e115, see Fig. 8, having a f crank pin e311 engaged by and extended through a slot 037 in the end of an upright link 038, secured at its lower end to a crank c99on a rock shaft (349, having bearings in suitable lugs C41 attached to the box door-see Fig. 1,the rock shaft (340, having an upright finger c42which is normally engaged by the frangible cover- Y of engagement with the rod or arm G31, thereby permitting the clock or motor mechanism, which is normally Wound up, to start and, actuate the striker, thereby sounding the bell G20 and giving an alarm'to persons in the vicinity of the box, that the frangible covering has been broken. \Vhe'n the motor is started, it revolves the crank C51, and rocks the lever or arm vC29 up and down, which motion is transmitted by the spring 028 to the farther end of the lever 023, viewing Fig. l, and rocks the said lever so as to bring the striker 021 into contact with the bell 029.

In the normal condition of the transmitting apparatus or box, the door A is closed and locked, and thel operating parts of the transmitting mechanism arein the position shown in the diagram Fig` ll, the pointer (191 registering with the O indication on the dial 'A4,

Aandrthe stud or projection o9 being engaged by the fingers c7 cs. When in this condition, the box or transmitting apparatus forms a fire alarm box, and may be operated by breaking the frangible cover c11and pulling the hook 012 to the bottom of its Vslot 013, which action moves the segmental gear 0,19 into-the full line position shown in Fig. 7, so that, when the hook is released, the gear 1.19 is returned to its normal position shown in Fig. 6, by the -spring (121, and the break wheel shaft 0.9 is

rotated, preferably three times, that is, the

break wheel shaft makes three complete revolutions to send in what is technically called three rounds of the signal, indicated by the break wheels a2 a3 a4, which is the same signal in each case, namely, the number indicative of the box. In the revolution of the break wheel shaft a9, the normally closed metallic circuit is open at the teeth or notches ax on the periphery of the wheels a2, a4, and the circuit interrupted, thereby permitting the armatures cl-(1 of the relays 512, 515, to be withdrawn by their retractile springs (12, (13, into contact with their co-operating back stops d1, d5, thereby closing the normally open local circuits D-D controlled vby said relays. The local circuit D includes in it a local battery d6 and a signal receiving instrument, preferably a tap bell (11, of any wellknown construction, While the local circuitv `lniuals.

D includes a local battery (12, and a message recording apparatus R, shown as a register of any ordinary construction, havingits electromagnet (19 included in the local circuit D', the said local circuit D also including in it, as herein shown, an audible signal receiving instrument or tap bell d10. At each break in the metallic circuit, occasioned by a tooth on the wheels a2 d4, the relays 512, 515 are demagnetized and the local circuits D-D are closed, thereby operating the audible alarms (17, C119, and the register R, upon which latter the signal indicated by the box number is permanently recorded.

. The signal transmitted by the break wheels a2 (14 with the box door closed as described, constitutes the fireralarm signal, and, as has been described, is transmitted from the box or apparatus to the central station three times in succession, that is, one operation of the hook transmits three rounds of the box number.

In the normal condition of the apparatus, the signal transmitted to the receiving station is sent over a normally closed metallic circuit, which may be traced as follows, vim-from the positive pole of the battery B by Wire 510 to the relay 512, thence by the kwire 51s to the conducting strip or segment 5, thence by the pens or brushes 55 56 to the conducting segment 5 marked O, thence bythe branch Wire 525 to the pen 524 co-operating with the break wheela1,through the break wheela1 and shaft a9 to the `break wheel a2, thence by its'co-operating pen 520, wire 519, and switch lever 512, to the terminal stud 517, thence by wire 5111, relay 515, and wire 514 to the negative pole ot' the battery.

In order to increase the efficiency of the lire alarm service by increasing the chances for receiving the signalin case of a break in either side of the line or metallic circuit, as, for instance, in case of a break in the line wire 519, as represented at d15,'Fig.t12, the transmitting mechanism of the box or apparatus, is provided as herein shown with a circuit controller, actuated by the pull bar G23, the said circuit controllerbeing shown as an arm c1211, see Figs. 10 and ll, fast on the shaft (1,29, and provided at its outer end With a projectionl C121 having,as shown, a convexed surface, which co-operates with circuit terminals c122- 6123, secured to an insulating support or block (121 fastened tothe frame work d10, of the transmitting mechanism, the circuit terminals (122 (123 being normally separated or electrically disconnected as represented in Fig. ll. The circuit terminals 122 C123 are included in or form a part of a grounded branch circuit, which is normally open at the said circuit ter- The circuit terminal 122 is connected by wire (125 to the pen 523 cooperating with the break wheel a3, and the 'circuit terminal (123 is connected by wire c1911 to Athe groundv G.

The circuit controller (129, operated by the pull bar (123 is preferably constructed and so secured to the shaft d20, as to be broughtinto contact with the circuit terminal C122 at the IOO IIO

end of the downward movement of the pull bar (122 and hook 012, and to remain in contact with the circuit terminal cZ22, while the break wheel c2, is making its first complete revolution, so that the grounded branch circuit at the box will be closed between the terminals (Z22 (Z22 during one complete revolution of the break wheels, preferably d uringthe irst complete revolution.

In the normal condition ofthe transmitting apparatus, the contact pen Z123 is out of contact with the break wheel a2, and the grounded branch is also open at this point, but as soon as the break wheel shaft commences to rotate, the pen Z122 makes contact with a tooth or raised portion of the break wheel (L2, to close the grounded branch, and as the break wheel (t2 is rotated, the raised portions or teeth pass from under the contact pen Z122, and open the grounded branch circuit at the break wheel, while the same is maintained closed at the circuit terminals C122 d22, the said terminals being held in contact with each other by the circuit controller cl2", until the break wheel shaft has made a complete revolution. V'Vhen a break occurs in either side of the main line or metallic circuit, such as at (Z15, in the line wire Z112, the relays Z112, Z115, are demagnetized, and the local circuits D, D', closed, thereby operating the register' and bells at the central station, and notifying the operator therein that a break has occurred in the line. In order to again complete a circuit for the relays Z112, Z115, over the unbroken line wire, and at the same time to employ the same receiving instruments in the local circuits upon which the signal is received when transmitted over the metallic circuit, and also to utilize the same metallic circuit battery without change, I have provided a series of switches (Z211, (Z21, (Z22, and Z112, preferably connected together as by a bar d23, joined to an actuating lever (Z24 pivoted as at CZ25, so that all the switches may be operated in unison or simultaneously by moving the lever dm.

The switches (Z211, (Z21, are included in the local circuits D and D', the switch d20 being pivoted as at (Z2G and co-operating with studs or terminals Z22 CZ28, connected respectively to the back stop (Z4 and the front stop (Z22 for the armature (Z of the relay Z112, while the switch cZ21 is pivoted as at (Z111 and co-operates with the terminal studs cZ11 LZ12, connected respectively to the back stop (Z5 and front stop (Z'12of the armature (Z of the relay Z115. The switch (Z22 is connected by a wire (Z111 to a ground G located in the central oilicc or station, and is adapted to be brought in contact with a terminal stud (Z15, joined by wire Z111 to the terminal stud Z117, with which the switch Z118 co-4 operates, when the metallic circuit is unbroken or in its normal condition, as represented in Fig. ll, theswitch Z112 being adapted to be moved into contact with aterminal stud CZ", joined by wire Z111 to the Wire Z112.

ln the normal condition of the main line circuit, that is, when the said circuit is complete as a metallic circuit and its line wires are unbroken, the switches occupy the position shown in the diagram Fig. ll, that is, the main line switch Z112 is in contact with the terminal stud Z117 to complete the main line, and the switches d2), d, of the locals D--D are in contact respectively with the terminals (Z311, cZ11, connected to the back stops (Z1, (Z5, for the armatures of the relays Z112, Z112, the grounded circuit switch (Z22 being at such time disconnected from its co-operating terminal CZ, to open the grounded branch circuit at the central station.

lf a break should occur in one ofthe main lines, as for instance, at CZ15, Fig. l2, the relays Z112, Z115 become demagnetized and their armatures are withdrawn against their back stops (Z1, (Z5. As soon as the relays become demagnctized, the register is started and notiiies the operator, by making a long dash upon its tape, that the line is broken. The operator then moves the switch lever (Z2'1 into the position shown in Fig. 1211, thereby throwing the switches dio, CZ21, (Z22 and Z11B into the positions shown in Fig. l2, the switch (Z211 being brought in contact with the terminal stud (Z22 connected to the front stop Z22 for the armature (Z, and the switch @Z111 being brought into Contact with the stud cZ'12 connected to the front stop (Z1'2 for the armature (Z, and the main line switch Z11E1 being connected to the terminal stud d", and the ground switch (Z22 being brought into engagement with its co-opcrating stud or terminal (Z11. \Vith the apparatus in the central station in this condition, the circuit is transformed or converted from a metallic into a grounded circuit normally open at the transmitting apparatus, namely, between the contact pen Z123 and the break wheel (L2, and between the circuit terminals cZ22, (Z22. Zhen the pull bar (122 is operated to transmit a fire alarm signal, the grounded circuit is closed between the terminals (Z22, CZ22, by the circuit controller (Z211 as described and in the present instance, remains open between the break wheel (r2 and its co-operating pen Z122, until the pull bar (L22 is released by the operator and the break wheel (t2 is set in rotation. As soon as the wheel @22 is set in rotation, its teeth or raised portions are successively brought into engagement with the contact pen Z122, and the grounded circuit momentarily closed, thereby energizing the relays Z112 Z115, which attract their armatures (Z, CZ', into contact with their front stops Z22 d1, thereby closing the local circuits D, D. In this manner the box number indicated by the teeth on the break wheel a2, which are precisely the same as the teeth on the break wheels (L2 a1, is received upon the signal receiving instrument Z1 in the local circuit D, and also upon the signal receiving instrument, (Z111, and the register R, in the local circuit D.

It will be noticed, that when the metallic circuit is converted into a grounded circuit as just described, the battery B remains unchanged, and also that the metallic` circuit re ceiving instruments in the local circuits are employed without change, to receive the signal when transmitted over the grounded circuit.

The grounded circuit referred to may be traced as follows, viz: from the positive pole of the battery B by wire Z910, relay Z912, wire Z913, contact strip or segment-Z9, contact Ybrushes Z95 196, contact segment Z9 marked 0, wire Z925, contact pen Z924, break wheel a, shaft a9, break wheel c3, contact pen Z923, wire 125, terminals 3122, 123, and wire (Z215 to the ground G, from thence to the ground G', wire C144, switch (132, wire C216, terminal stud Z917, wire Z916, relay Z915, and wire Z914to the negative pole'of the battery.

The signal istransmitted over the grounded circuit just described, when the break oc curs in one side of the line, as at (115, but in case a break should occur in the left ofthe line, as at the point marked d150, Fig. l2, the signal would be transmitted overa grounded circuit including the right of the line, which may be traced as follows, viz: from the positive pole of the battery B by wire Z910, relay Z912, wire Z913, wire d, switch Z918, wire Z919 to contact pen Z920, break wheel a2, shaft a9, break wheel a3, 'contact pen Z923, wire C125, circuit terminals d, da, wire CFG to ground Gr, thence to the ground G'wire al, switch C132, wire (146, terminal stud Z917, Wire Z916, relay Z915, wire Z914 to the'negative pole of the battery B.

When the box door A is closed, the signal transmitted from the said box to the central station by breaking the frangible covering C14 and operating the hook 012, is received in rthe central station in a series of substantially long interruptions or breaks, the relays Z912 Z915 both responding to the signal transmitted, which has been described as a tire alarm signal. The relay b1? is constructed so as to respond only to substantially long breaks in the circuit, whereas the relay Z;915 is constructedA so as to respond to substantially short breaks or interruptions in the circuit as well as to long breaks, the said relays being respectively desi gnated by me as the slow and fast relays.

In order that the transmitting apparatus or box may be used for other purposes than a tire alarm box, as for instance as a police sig nal box, the signal transmitting mechanism is constructed and arranged to transmit the signal indicative of the box, which in the normal condition of the box with its door closed, is the fire alarm signal, in a series of substantially short impulses, which operate the fast relay Z915, and do not operate the slow relay Z912, the signal transmitted being received upon the register R, in a series of substantially short marks, and as herein represented being also received upon the bell Z910, ina series of substantially short'or sharp blows.

The change in the transmitting mechanism 5 from -a series of long interruptions to a series of Ashort interruptions, is preferably accomplished by means of the speed changing device above described, and in orderto render this change positive and obligatory, the pointer Q57 is moved from its normal position shown in Fig. 3 to the position shown in Fig. 4 by the opening of the box door A', the said pointer being automatically turned into the position shown in Fig. 4, when the door is opened, by the finger c8 acting against the lstud or projection egon the said pointer.

When the pointer a3? is moved from the 0 indication on the dial A4 to the indication marked l as shown in Fig. 4, the shaft (135 is rotated one tooth of the star wheel or disk @320, and the lever e30 is turned by the cam groove u32 in the said disk, so as to slide the weighted disk @L27 on the escape shaft 0.17, and Withdraw the said disk a? from engagement with the escape am, thereby leaving the latter free from its Aretarding influence, and permitting the motor mechanism to operate ata substantially high rate of speed, so that if the hook C12 should be operated with the box door open, the break wheel shaft a9 and its break wheels mounted thereon, will be rotated at a substantially high rate of speed, and thereby cause the signal indicated by the break wheels d2, d5, a4, to be transmitted to the central station in a series of substantially short impulses or breaks, which are received only upon the fast relay Z915, the slow Vrelay Z912 remaining in its normal condition.

The signal indicated by the box number alone, that is, by the break wheels a2 a3 d4, when transmitted in a series of substantially short impulses may and preferably will indicate a test signal, as will be described, but iu order to more Vdistinctly particularize any special signal in police work, I prefer to employ an additional signal in conjunction with the box number transmitted in a series of substantially short'impulses.

Among the more importantV signals employed in police work, is what is known as the wagon call, which in the present instance may be supposed to be the box number transmitted in a series of short impulses and two substantially long impulses or breaks in addition to the box number. Owing to the importance of this signal and to the frequency with which it is used, I prefer to construct the transmitting apparatus, so that'when the box dooris open and the pointer @37 cop-operates with the indication marked l, the wagon call will be transmitted when the hook 01,12 is actuated. To accomplish this result, I have provided the break wheel shaft a9 with theaux- .iliary wheel a5 having on its periphery the two `with the box door open, and the pointer asl registering with the indication marked l on the dial, and the circuit terminal pens or brushes b5 Z96 in engagement with the circuit ICO ris

terminal strip b and segment ZJ marked l, the signal transmitted consists of the box number indicated by a series of substantially short marks on the register tape plus two substantially long marks or dashes made by the breaks 10 in the wheel (t5, which signal would indicate a wagon call, but if desired the relative positions of the break wheel d5 and break wheels a2 a3 d4 may be changed so that the breaks 10 may precede the box number. The circuit over which the Wagon call is transmitted with the metallic circuit wires unbroken, may be traced in Fig. 11 as follows, viz: from the positive pole of the battery B by wire Z110, relay 512, wire bis, circuit terminal strip l), contact brushes b5 b, terminal strip b marked l, wire 634, auxiliary wheel d, shaft et. Wheel d2, contact pen Z120, wire 1119, switch (18, wire 1o16, relay Z215, and wire Z214, to the negmiv@ pole of the battery. The impulses or breaks made by the teeth on the wheel a2, are 0f Such duration that they do not demagnetize the relay Z212 but do dcmagnetize the relay p15, whereas the breaks or notches 10 are of suficieul; length to momentarily demagnetize the relay Z912 in addition to demagnetizing the relay Z215, S0 that the relay Z915 alone responds tothe main portion of the signal when transmitted with the box door open, that is, t0 the box number, and both respond to the auxiliary portion ot' the signal, namely, tothe breaks or notches 10 in the auxiliary wheel. The Wagon signal as herein indicated, is received upon the tape of the register in a series of substantially Short marks followed by two Substantially short dashes longer than the marks @om prising the main signal, but shorter than the marks comprising the fire signal as represented in Fig. 14, and the said wagon signal is also received upon the audible signal receiving instrument or bell d10, while only the auxiliary signal transmitted by the breaks 10 in the signal wheel a5 are received upon the audible signal receiving instrument or bell C17, which being preferably a louder tone bell than the bell d10 gives notice to the operator that an important signal requiring immediate attention has been received and also designates what important signal has been received. The signal transmitting mechanism is also provided as herein shown with the auxiliary Wheels CLG, a7, as, the auxiliary wheel a, being provided with one substantially long break marked 12 in Figs. 1l and 12, the wheel a7 with one substantially short break 13, and the wheel d8 with two substantially short breaks 14, substantially widely separated. The auxiliary wheel d6 is connected as has been described, to the circuit terminal b' marked 2, and is brought into circuit when the pointer @L37 is moved to the indication marked 2, the contact brushes b5 b being at such time in engagement with the contact strip l) and the contact strip ZJ marked 2.

The signal indicated by the box number in substantially short impulses together with the substantially longbrcak l2 made by the wheel c" may and preferably will indicate a telephone signal, see Fig. 14, and the signal produced by the box number in substantially short impulses together with the substantially short break 13 in the wheel a7, which is brought into circuit by the officer or other duly authorized person turning the pointer to register with the indication marked 3 on the dial. and thereby bring the contact brushes b5 b into engagement with the circuit terminal strip b marked 3 and the circuit terminal strip b, may indicate the route or post number of the ofiicer, which in this present case would be route No. 1. See Fig. 14. The pointer fr may be still further turned to register with the indication marked 4 on the dial, and bring the contact brushes b5 h6 into engagement with the circuit terminal strip ZJ and the circuit terminal strip b marked 4, thereby incl udiug the auxiliary wheel a8 in the electric circuit, the signal produced being represented by the box number in substantially short impulses together with two substantially short dashes made by the breaks 14, which would indicate that a police ollic'er on route 2 was reporting,r at the box. When the telephone signal is transmitted, the complete signal including the box number, and the substantially long break 12, is received upon both the register R and the bell bm, and only the auxiliary signal or break 12 is received upon the bell dl. The route or post signals, including the box number in substantially short impulses together with the short breaks 13 or 14, operate the fast relay Z115 and do not operate the slow relay Z912, and the said signals are received only on the register R and bell d10, which latter in practice is preferably of softer tone than the bell di, and the bell (Z7, is clearly distinguished from the bell d10.

The pointer am may be turned to register with the indication marked 5 on the dial A, thereby moving the contactbrusbes b5 Z1 and bringing the brush b into engagement with the terminal strip b marked 5, which is connected by Wire f with the branch wire 1125 joined to the contact spring i224 co-operating with the break wheel a4. 1f the hook should be pulled With the pointer L37 in register with the indication marked 5, the box number alone would be transmitted to the central station in a series of short impulses as represented in Fig. 14, and would be received upon the register R and bell di". The box number alone in a series of short impulses may and preferably will indicate a test signal, whereby the re alarm part of the signal transmitting mechanism is tested and maintained in good electrical and mechanical condition Without sounding a lire alarm,

The circuit for the test signal may be traced as follows, viz: from the positive pole ot' the battery B, by Wire bw, relay Z212, wire Z913, terminal strip l), contact brushes b5 b, terminal strip b marked 5, wires f, Z925 and pen Z224 to break wheel a4, through the said break Wheel,

shaft 0,2,.break lwheel 0,2, wirevbw, switch 1918, Wire b1i, rela`y Z915 and wire Z914 to the negative pole ofthe battery.

It will .thus be seen that the important signals such as the wagon and telephone calls, are readily distinguishedaudible from the route signals, and in addition are clearly distinguished audible from each other. It will be noticedy that when the pointer has been movedto register with any other indication than the normal or zeroindication, the signal or number indicative of the box is transmitted in aseries of substantially shortimpulses or characters, but thatwhen the pointer is in its normal or zero position, the signal or number indicative of the box is transmitted in a series of substantially long impulses.

When the 'signal or box number is transmitted in a series of substantially long impulses, the signal produced will actuate both the fast and slow relay, and will sound the bells d2, d10, and in practice the bell C17 will preferably be made of a much louder tone than the bell d10 to clearly distinguish the Vfire alarm signals from the police alarm signals received upon the .bell d10.

In order to prevent the pointer am from being moved back into its normal position, in register with the O indication, on thedial, while the box door is open, the finger o8 is made of sudicientlength to engage with the projection e9 on the pointer before the pointer can be brought to the O indication, and preferably tlie finger o8 will engage with the projection e9 when the pointer registers with the indication :narked l on the dial.

While the box door remains open, the slide bar c and its finger e8 are practically immovable in the direction indicated by the arrow 40, in Fig. 4, and consequently the finger c8 acts as a stop to limit the backward or return movement of the pointer to its normal position. When the box door is being closed, the slide bar c, is moved in the direction indicated by the arrow 50, see Fig. 4, and the finger c7 acts on the projection c2, and moves the same backward or in the direction indicated by the arrow 50, and thereby turns the pointer back into coincidence with the O indication on the dial,that is, into its normal position when the door is closed. The finger c7 is preferably vmade movable, and when the pointer L37 is moved back toward 'its normal position, the stud or pin C9 carries the said' linger upward until the said stud clears the same and occupies a position between it and the finger e8. This construction enables me to make the finger c7 long enough to positively engage the stud e9 and thereby avoid any possible danger of the slide bar c being moved, when the door is closed, without moving the pointer back intov its normal position.

When the box or transmitting apparatus is used as a police box, I prefer that but a sinc which the dial A4 in the line with the slide therein, has pivoted to it as it has atco, a doge5l acted upon by a spring 052, the said dog being removed out of the path of movement of the hook cl2 and pull bar 0,23, when the box door is closed, by means of a projection 053 secured to or forming part of the casingpl.

When the box door A is open, the projection 053 is removed from engagement with the pivoted dog 051, and the latter is brought by the spring 052 into the path of movement of the hook cl2, to limit the downward movement of the pull bar @22, the pivoted dog C51 being preferably made of such length, that the pull bar n.23, when the hook C12 is actuated, will en` gage the said dog after the pull bar has been moved a suflcient distance to actuate the transmitting mechanism to produce one complete round of the signal.

As herein shown and described, the circuit closing arm d20 of the transmitting mechanism, is arranged to engage the circuit terminals C122 wCX23 and close the ground tap at the box When the hook 012 has beenmoved to the end of its slot, that is, when it has been moved a suicient distance to transmit three rounds of the signal, and as thus arranged the ground tap at the box isnot closedwhen the hook is pulled toY send. iu a police signal. I,prefer this arrangement but I do not desire to limit myself in this respect, as it is evident that the arm d20 may be so arranged, as to close the circuit terminals 01220123 on the last round of the iire signal, which would be the same as the single round of the police signal, and in this latter case, the police signals might be received at the central station or office in case ot' a break in either of the line wires. For example, if one of the line wires should be broken, asV for instance, the line wire 1919, it being broken at the point d15 Fig. 12, a police signal, as for instance the Wagon call would be received over the other side of the line, that is, over the line wire 513, substantially in the same manner as previously described in connection with the main tire alarm signal. The circuit for the wagon signal may be traced as follows, viz: from the positive pole of the battery B by Wire i910, relay 612, wire 013, circuit terminal strip b. brushes 195126, circuit terminal strip b marked l, wire Z934, auxiliary Wheel a5, shaft a9, break wheel a3, contact pen 523, wire (125, circuit terminals C122, d22, Wire d26, ground G, thence to the ground G', wire (144, switch (Z22, wire d, terminal stud b, wire 516, relay Z915, and Wire Z114 to the negative pole of the battery.

The pointer C127 is preferably provided with a hole or opening d, with which co-operates a stud or post d ou the inside of the door A', when the pointer is in its normal position and the box door is closed, the 4said stud or post being adapted to strike against the pointer and prevent the door A being closed, until One form of stopping device re- IOO IIO

the pointer is in its normal position. This is of considerable importance practically, as the ofiicer after reporting an on duty call, may forget to turn the pointer back, so that the stud or projection of will be engaged by the i iinger c7. For instance, the oliicer may have turned the pointer into the position shown in Fig to send in an on duty call, and might forget to turn the pointer as above described. In this case, an attempt to shut the door with the pointer in the position shown in Fig. 5, would cause the stud or post d on the inside of the door to strike against a solid portion of the pointer and prevent the door being closed.

When the tire alarm signal is being transmitted it is im portant that the said signal should not be capable ot' being changed as by opening the box door, as in this case the Whole or part of the signal would be transmitted in a series of quick or short impulses, which would be confusing to the operator in the central office, and also it is of very great importance that the change in the signal from a police signal of quick impulses to a fire signal of long impulses should not occur after the mechanism had been operated to transmit a police signal.

To prevent the tire signal of long impulses being changed to a police signal of short irnpulses by opening the box door after the signal has been pulled, and also to prevent the police signal being changed into a fire signal as described, I have provided a stopping or locking device for the door, which is herein shown as a bar or linger h secured to or forming part of the operating hook, the said bar or finger in the present instance performing the double function of preventingV the box door being opened when the hook has been moved from its normal position, and of preventing the box door being closed after the said hoolr has been pulled with the box door open. The stopping device orlinger h in the normal position of the box, that is, with the box door closed, registers with asubstantially horizontal notch h' in the back of the auxiliary casing C15. Vhen the box door is closed and the hook is in its normal position, the linger or stop 7L lies Within the auxiliary casing in line with the notch h', and when the glass is broken and the hook operated to send in a lire alarm, the stop or finger h is carried down out of line with the notch h', and if it is attempted to open the box door after the hook has been pulled down to send in a tire signal, the back of the casing 015 engages the back ot' the stop or finger lt and prevents the door being opened, the bach` of the tinger h forming a front stop for the door. When the hook is in its normal position, the box door may be opened to transmita police signal, as above described, but it it is attempted to shut the box door while the police signal is being transmitted, as might happen in practice owing to the carelessness of an officer, who might think his signal had been sent, it will be seen that the front ofthe lingerorstop h, being mense out of line with the notch 7L', as long as the hook is out of its normal position, will be engaged by the back of the auxiliary casin g as represented in Fig. l5, and thus prevent the door being shut sufficiently far to change the police signal into a fire signal, the front end of the finger 7L constituting a back stop for the door.

I prefer the construction shown and described for preventing the change in signals described, but I do not desire to limit my invention to the particular construction shown. Vith the construction herein shown, it will be noticed that both relays respond to the fire signal transmitted in substantially long impulses, and consequently it the relay b should become inoperative from any cause, the fire alarm signal would be still received upon the fast relay Z115, and would be received upon the register R and the belldl", and would be readily distinguished audibly from the pclice signals. the signal is received upon the bell d10 independent of the register R, and that the bell d10 constitutes a safe guard, that is, all the signals are audibly tapped off or sounded on this bell.

The importance of the bell d10 maybe readily comprehended, as it is all important that when an important signal, such as a lire alarm, or a wagon or telephone signal is transmitted, it should be received at the central ollice. In other signaling 'systems as now commonly constructed and known to lne, there is but one chance offered for receiving the signal over the metallic circuit, and it a portion ol the receiving apparatus becomes inoperative, the signal is lost, whereas by the construction of receiving apparatus herein shown, which is substantially the saine in principle as that shown and described in United States Patent No. 472,983, granted to me April 19, 1892, the tire alarm signal has three chances of being received, viz: first, upon the bell 17; second, upon the register R,and, third, upon the bell d10, so that in case the bell (Z7 becomes inoperative it may yet be received upon the reg ister R and bell d10, and iE both the bell dl and register' R should become inoperative it will still be received upon the bell di". In police signaling the register R and bell d1 receive all signals, andy in case the register becomes inoperative, the signal is received on the bell d10.

I claim- 1. In a signal transmitting apparatus, the combination of the following instrumentali` ties, viz.a box or case provided with a door, a signal transmitting mechanism located therein and constructed and arranged to transmit a signal or number indicative of the said box or transmitting apparatus in two distinct sets ot' characters, and operatively connected to the box door to be automatically changed by the act ot' opening the door to place the signal transmitting mechanism in condition to transmit the box number in a dif- So also it will be noticed that.

IOD

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ferent set of characters from that in which it is transmitted with the b ox doorclosed, substantially as described.

2. In a signal transmitting apparatus, the combination of the following instrumentalities-viz.-a box or case provided with a door, a signal transmitting mechanism located therein and capable of transmitting distinguishable signals, andan intermediate connection positively joining the said door and signal transmitting mechanism, whereby the said signal mechanism is automatically operatedby the act of opening the box door to place it in condition to transmit a signal distinguished from the signal when transmitted with the box door closed, substantially as described.

3. Ina signal transmitting apparatus, the combination of the following instrumentalities,-viz.-a box or case provided with a door, a signal transmitting mechanism located in said box and capable of transmitting a signal or number indicative of'the said box or transmitting apparatus in two distinct sets of characters, and an intermediate connection joining the box door with the signal transmitting mechanism, whereby the signal or number lmay be transmitted in one set of characters when the door is closed and in a different or distinguishing set of characters when the box door is opened, substantially as described.

4. In a signal transmitting apparatus, the combination of the following .instrumentalities--via-'a box or case provided with a door, a signal transmitting mechanism located therein and capable of transmitting distinguishing signals, a pointer to select the said signals, and an intermediate connection joinpose specified. Y

5. In a signal transmitting apparatus, the combination of the following instrumentalities-viz.a box or case provided with a door,

va signal transmitting mechanism located therein and capable of transmitting distinguishable signals, and an intermediate connection positively joining the said door and signal' transmitting mechanism, the said intermediate connection being capable of detachment from the signal transmitting mechanism after the box door is open, substantially as described.

6. In a signal transmitting apparatus, the combination of the following instrumentalities-viz.-a box or case provided with a door, a signal transmitting mechanism located therein and capable of transmitting distinguishable signals,a pointer to select the said signals, and an intermediate connection joining thesaid pointer to the `box door and constructed to permit the pointerto be moved in one direction after the door is opened and to limit its movement in a reverse direction, substantially as described.

7. In a signal transmitting apparatus, the

combination of the following instrumentalities-viz.a box or case provided with a door, a signal transmitting mechanism located therein and capable of transmitting distinguishable signals, a pointer to select said signais operatively connected to said door to be moved automatically from its normal position with the door closed to a different position by the act of opening the door, substantially as described.

Y8. In a signal transmitting apparatus, the combination of the following instrumentalities-viz.-.a box or case provided with a signal transmitting mechanism constructed to transmit its signal in two different sets of characters, an actuating device or hook for said transmitting mechanism, a door for said box or case constructed to permit of access to the said actuating device when the said door is closed, and a front stop or locking device to prevent the box door being opened after the actuating device has been moved from its normal position but which permits the said door to be opened when the actuating device is in itsnormal position, substantially as described.

9. In a signal transmitting apparatus, the combination of the following instrumentalities-viz.-a box or case provided with a signal transmitting mechanism constructed to transmit its signal in two'diere'nt sets of characters, an actuating device or hook for said transmitting mechanism, a door for said box or case constructed to permit of access to the said actuating device when the said door is closed, and a back stop to prevent the box door being closed after the actuating device has been moved from its normal position with the box door open but which permits the door to be closed when the -actuating device is in its normal position, substantially as described.

10. In a signal transmitting apparatus, the combination of the following instrumentalities-viz.-a box or case provided with a signal transmitting mechanism, an actuating device or hook c12 for said signal transmitting mechanism, a door for said box or case, an auxiliary case or frame secured to or forming part of the inner side of the box door,-and into which the actuating device or hook G12 extends when the box door is closed, and a frangible covering C14, forming part of the box door and normally rendering the actuating device c12 inaccessible, substantially as described. I

1l. In a signal'transmitting apparatus, the combination of the following instrumentalities-viz.-a box or case provided with a signal transmitting mechanism, an actuating device or hook c12 for said signal transmitting mechanism, a door for said box or case, an auxiliary case or frame secured to or forming part of the inner side of the box door, and into which the actuating device or hook c12 extends when the box door is closed, a frangible covering C14 forming part of the box door and normally rendering the actuating device IOO IIO 

